Yeah.. I have to say It's not been delivered as yet, The first thing I'm gonna do is check it in my system profiler for serial number. I think It'd be safe to say if it has no serial It's hooky. What's pissing me off is that my old battery is packed away in the loft with the rest of my life waiting to be moved to my new house. Do I go for it or what? Is the box among many other boxes marked 'old mac battery' I doubt it? Did I throw it away? I dunno?